log20.01 =-6.64385618977472
log20.02 =-5.64385618977472
log20.03 =-5.05889368905357
log20.04 =-4.64385618977472
log20.05 =-4.32192809488736
log20.06 =-4.05889368905357
log20.07 =-3.83650126771712
log20.08 =-3.64385618977473
log20.09 =-3.47393118833241
log20.10 =-3.32192809488736